Window frame



Aug. 16, 1932.

H. G. KLPP WINDOW FRAMEv Original Filed April 1'7".t 1929` /l #u l f6- faww/nto@ 176mg @ff/opp Patented Aug. 16, 1932 g UNITED'STATESJ iAENToFFlcE HENRY per'. Knorr, ,or fsro'imun, v'Wirsnigrrerztoiyr Originalapplication le April-17,

WINDOW FRAME isa'aseriai No'. 355,865; latent No. 1,790,428. Divided andthis appucation filed December 13, 1930;;7Seria1 No'. 502,216.

proof and can be matedV at the point of as-V sembly, irrespective ofexpansion and contraction of the wood composingthe same. In the windowframe art the connection betweenVV the blind stop and the pulley stilerespectively was, vat first, of flat formation. In the practicalart thiswas called a fsurfaced four sides connection. For windproofing andweatherproofing the connection relied entirely upon the tightness oftheconnection between the lflat contacting surfaces of the blind stopand pulley stile respectively.

The practical art later utilized a tongue and groove connection betweenthese parts in an eort to increase the weatherproof and moistureproofqualities of the connection'. These tongue and groove connections com.-prised a square bottom groove and a round nose tongue or a squaretongue. In the industry today the sections constituting the windowframes are required to be shipped in knock-down condition to the pointof assembly. Thus they may be manufactured in the State of Washingtonand vshipped in knocked-down condition to say the State of New York. Dueto the expansion and contractionV a tight interlitting connection be#tween the tongue and walls of the groove could not be obtained becausethe grooves necessarily were required to be of considerably widerdimensions than the tongues. Y

Such connections, therefore, would afford `merely an air baffle buttheir waterproofing characteristics proved to bel negligible. As

the result, in the practical art, it has been my experience thatmanufacturers considered the disadvantages attending the use of thesquare groove and ktongue connection to outweigh their advantages and asthe result, up until i I the advent of this invention, most practicalworkers in the art preferred the original con struction wherein thefaces between the blind stops and pulley stiles respectively were flat.'5-

lMy invention is based upon thevco'nception thata blind stop` may beprovided .with oppositely beveled walls of taperediformation acting incooperation with complemental tapered tongues, which'tongues arepreferably not-as great in length as the groovesfoll the purposehereinafter stated. F o

I have found that this construction actually seals the connectionagainst weather because of the constantly contacting faces -of thetapered tongues with the grooves irrespective of problems` of expansionand contraction, when shipping in knocked-down condition, the partsconstituting the window frame.

By the utilization and embodiment of my invention in window framestheparts ofthe frame maybe shipped to the ob and there' assembled withconvenience and accuracy, aA weather-tight joint between the pulleystile and the blind stop is insured; warping of `the parts is prevented,and a permanently true.-

groove is provided in which the sash may slide i without binding. Theparts may also be ac-k curately assembled without the necessityofspecial tools and also without the necessity of skilled labor. r l:Referring now to the drawing wherein corresponding numerals representlike'parts, Figure l illustrates one complete example ofthe physicalembodiment of the invention in a horizontal perspective view in sectionat one side ofthe windowframe; j Y,

Figures 2 and 34 are sectional views'y of a portion of a pulley stilewith wedge-shaped. tongues and a blind'stop .or strip havingcomplementary grooves in its face; V- n Figure l is a sectionalviewpartly in perspective of a portion of a window frame in which .asingletongue and "groove is used, yand Figures 5`and6 .are sectional viewsshowing respectively a portion ofthe pulley stile and a portion of theblindstop of Figure 4j This application is a divisional of' my aplication ASerial N o;,.`555,865,v filed April-1 ,j

shown, and the parting strip 4 is'secure'd inV the usual manner in thegroove provide ,in the inner face of the stile.

,.The groove for the upper vsash is formed by the parting strip 4andtheoverlapping edge 5 of the blind stop 6, the latter beingpartly-covered by the outer casing 7. The blind stop 6 is wider thanthethickness of the pulley stile to provide the overlapping edge V5 afterthe. sash and a suitable number of nails are used to secure the blindstop in the edge of thepulley stile.

Y :For-useas guides in accurately assembling the parts, to secure aweathertight joint, and to interlock the parts to prevent warping, the

edige of the pulley stile adjacent. the blind stop is provided with apair of spaced parallel tongues 9 and 10 which are wedgeshaped incrosssection, with both sides being correspondingly tapered, and thesetongues areitted into complementary grooves 11 and 112 in the adjoiningface of the blind stop. The depth of the grooves'is preferablygreaterthan the depth of the tonguesin order that thefwedge-shapedtongues may be forced into'lthe grooves to `insure maximum frictionalcontact of' the `sides of' the tongues with `the`side walls of thegrooves and Ito h'oldj the` adjoining faces of the Vpulley stile andtheblind. stop in 'close' contact. These' tapering-sides of the tongues andtapering side wallsofthe groove "also insure atight joint even .thoughshrinkage should take place lin either thev stile or blind stop. Y

The stile and blind stop are thus capable p oflbeing assembled-withaccuracyV as the tongues and grooves act as guides to secure tightnessand true alignment in assembling the parts. v Y v j 4In' Figures 4, 5and 6 the invention is disclosed wherein the stile 13 has a singlegroove 14- and the blind stop 15 has a single complementary groove 16;application is. addressed to this latter invention.' Y

f -As willbe noted froman inspection of Figure 4, the blind stopl isgrooved -near an ential expansion or contraction of the blind stop andpulley stile respectively.

The tongue and groove connection thus performs not only a wind baillebut a weathertight, seal joint, as well. ,j

VAsi the grains of the stile and vblind stop run in different directionsthese parts themselves, together withk the tongues andgrooves, s

aid in stiffening the frame against warping and in maintaining the sashgroove intruealignment, thus avoiding the danger of bindig the sash. Y

Having thus described my invention, what I claim is:

^ In a window frame, the combination with ay pulley stile havingalongitudinally eX- tending "tongue near one side thereof, said tonguehavin its-opposite edges correspondingly tapere vrelatively to eachother to define a wedge-shaped element, of a'blind stop having a groovecomplemental in shape tothe. tongue, said groove being placed near thecorresponding side of the blind stop, and a fastening device driven intothe blind stop in a perpendicular 'direction whereby to equalize thecompressive forces relative to said tapered contacting surfaces, saidfas-v tening devicev being offset from thetongue and groove connectionwhereby to preventl The claim of thisv edge thereofandfthe pulley stilehas formed `thereonfthe wedge-shaped tongue -14 near acorrespondingedgethereof.l This is highly important because it provides a space forthe nail 8, inl` a perpendicular. direction, wherebyto equalizecompressive forcesrelatilve tothe taperedf contacting surfaceswithoutysplitting the. tongue. If a tongueand groove-connectionwereplaced in the middle,

